In the most recent Incredible Hulk film, Tim Roth played Emil Blonsky who eventually becomes The Abomination. Roth has confirmed that Marvel may end up bringing him into to more Marvel films. When asked if Marvel has plans for his character to show up in other Marvel films he said:
"They have, but in a very different way. I don't want to get into it, but they signed me up for three [films]. It could be anything.
Just because they signed him for three films doesn't mean they will use him, but I loved Roth character in The Incredible hulk, and it would be cool to see Blonsky come back. The question is when and where will we see him? Perhaps, The Avengers or a couple more Hulk sequels? At the end of Hulk Tony Stark approaches Gen. "Thunderbolt" Ross, to talk about the team that is being put together, so there is a definite tie-in. As for Edward Norton returning to reprise his role as Bruce Banner in The Avengers... he isn't saying anything.